Overview
The 74HC166D is a high-speed CMOS 8-bit parallel-in/serial-out shift register produced by Toshiba Semiconductor and Storage. This device is fabricated using silicon gate C2MOS technology, which allows it to achieve high-speed operation similar to LSTTL while maintaining the low power dissipation characteristic of CMOS technology. The 74HC166D features both parallel and serial input modes, controlled by the SHIFT/LOAD input, and includes a gated clock input and an overriding clear input. This makes it versatile for various digital circuit applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (VCC) | 2.0 to 6.0 | V |
| Operating Temperature (Top) | -40 to 125 | °C |
| Maximum Clock Frequency (fMAX) | 57 MHz (typ.) at VCC = 5 V | MHz |
| Power Dissipation (ICC) | 4.0 µA (max) at Ta = 25 °C | µA |
| Propagation Delay (tPD) | 15 ns (typ.) | ns |
| Number of Bits | 8 | - |
| Package Type | 16-SOIC (0.154", 3.90mm Width) | - |
Key Features
- High speed operation: up to 57 MHz at VCC = 5 V
- Low power dissipation: maximum of 4.0 µA at Ta = 25 °C
- Wide operating voltage range: 2.0 V to 6.0 V
- Balanced propagation delays: tPLH ≈ tPHL
- High noise immunity and latch-up performance exceeding 100 mA per JESD 78 Class II Level B
- Inputs equipped with protection circuits against static discharge or transient excess voltage
- Synchronous parallel-to-serial and serial input for easy expansion
Applications
The 74HC166D is suitable for a variety of digital circuit applications, including:
- Synchronous parallel-to-serial data conversion
- Serial data transmission and reception
- Digital signal processing and data storage
- Automotive and industrial control systems where low power and high reliability are crucial
Q & A
- What is the maximum clock frequency of the 74HC166D?
The maximum clock frequency is 57 MHz at VCC = 5 V.
- What is the operating voltage range of the 74HC166D?
The operating voltage range is from 2.0 V to 6.0 V.
- What is the power dissipation of the 74HC166D?
The maximum power dissipation is 4.0 µA at Ta = 25 °C.
- What type of package does the 74HC166D come in?
The 74HC166D comes in a 16-SOIC package (0.154", 3.90mm Width).
- How does the SHIFT/LOAD input control the operation of the 74HC166D?
The SHIFT/LOAD input controls whether the data is loaded in parallel or serial mode. When high, serial data input is enabled; when low, parallel data inputs are enabled.
- What is the purpose of the clock enable input (CE) in the 74HC166D?
The clock enable input (CE) disables the clock input (CP) when it is high, preventing data from being shifted.
- Does the 74HC166D have any protection against static discharge?
Yes, the inputs are equipped with protection circuits against static discharge or transient excess voltage.
- What are the operating temperature ranges for the 74HC166D?
The operating temperature range is from -40 °C to 125 °C.
- How does the clear input function in the 74HC166D?
A direct clear input overrides all other inputs, including the clock, and sets all the flip-flops to zero.
- Is the 74HC166D compliant with any specific standards?
Yes, it complies with JEDEC standards for HBM and CDM, and it exceeds 2000 V and 1000 V respectively.
